Ni-Co-B catalyst promoted Thermal Decomposition of Composite NaNH2-NaBH4 used as Hydrogen Storage Material

BAI Ying; WU Feng; YANG Jianhu; WU Chuan; BAO Liying

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Ni-Co-B catalyst promoted Thermal Decomposition of Composite NaNH2-NaBH4 used as Hydrogen Storage Material

BAI Ying,WU Feng,YANG Jianhu,WU Chuan * #,BAO Liying

Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China

*Correspondence author

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Funding: Research Fund for the Doctoral Program of Higher Education of China （No.20121101110042）, National Natural Science Foundation（No.20806010）, Program for New Century Excellent Talents in University（No.NCET-12-0047）

Opened online:28 March 2014

Accepted by: none

Citation: BAI Ying,WU Feng,YANG Jianhu.Ni-Co-B catalyst promoted Thermal Decomposition of Composite NaNH2-NaBH4 used as Hydrogen Storage Material[OL]. [28 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4590679

NaNH2 and NaBH4 are structured as a composite hydrogen storage material, NaNH2-NaBH4. To improve the thermal decomposition kinetics of NaNH2-NaBH4, which is crucial to hydrogen releasing performance, Ni-Co-B is selected as a catalyst. To get the catalyst-promoted light-weight hydrogen storage materials, the composite hydrogen storage system was synthesized via a ball milling method with NaNH2, NaBH4 and Ni-Co-B. X-ray diffraction patterns show that the crystal structure of the NaNH2-NaBH4 is well kept after adding catalysts. In addition, Na3BN2 and metal Na are detected as a by-product in the Ni-Co-B promoted NaNH2-NaBH4 (2/1) through the thermal decomposition process. In addition, TG-DTA analysis indicates that the main decomposition stages of the metal boride promoted NaNH2-NaBH4 materials are split into three stages. Furthermore, the catalytic effects on the thermal decomposition kinetics are evaluated. The activation energy of the Ni-Co-B promoted NaNH2-NaBH4 below 250oC is 99KJ/mol, which are only 62.0% of that of the pristine NaNH2-NaBH4 (2/1), and implying better kinetics at low temperature decomposition range.

Keywords:Fuel cells; hydrogen storage material; NaNH2-NaBH4; thermal decomposition; kinetics

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